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@ -27,11 +27,15 @@
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(define (break-hards qs target-size debug hard-break? soft-break? finish-wrap-proc)
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(let loop ([wraps null][qs qs])
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(match qs
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[(? null?) (append* (reverse wraps))]
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;; ignore a trailing hard break
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[(or (? null?) (list (? hard-break?)))
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(append* (reverse wraps))]
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[(or (cons (? hard-break?) rest) rest)
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(define-values (head tail) (splitf-at rest (λ (x) (not (hard-break? x)))))
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;; head will be empty (intentionally) if qs starts with two hard breaks
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;; because there should be a blank wrap in between
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(define next-wrap (break-softs head target-size debug soft-break? finish-wrap-proc))
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(debug-report next-wrap)
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(loop (cons next-wrap wraps) tail)])))
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(define (nonprinting-at-start? x)
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@ -129,7 +133,9 @@
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(define q-one (q #:size (pt 1 1) #:printable #t))
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(define x (struct-copy quad q-one [elems '(#\x)]))
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(define zwx (struct-copy quad q-zero [elems '(#\z)]))
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(define zwx (struct-copy quad q-zero
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[printable (λ _ #t)]
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[elems '(#\z)]))
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(define hyph (struct-copy quad q-one [elems '(#\-)]))
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(define shy (struct-copy quad q-one
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[printable (λ (q [sig #f])
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@ -147,16 +153,16 @@
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[(start end) #f]
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[else #t]))]
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[elems '(#\space)]))
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(define br (struct-copy quad q-one
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[printable (λ (q [sig #f]) #f)]
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[elems '(#\newline)]))
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(define lbr (struct-copy quad q-one
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[printable (λ _ #f)]
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[elems '(#\newline)]))
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(define soft-break? (λ (q) (memv (car (quad-elems q)) '(#\space #\-))))
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(define (linewrap xs size [debug #f])
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(break xs size debug
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#:finish-wrap-proc (λ (xs) (list (length xs)))
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#:hard-break-proc (λ (q) (char=? (car (quad-elems q)) #\newline))
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#:soft-break-proc soft-break?))
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(add-between (break xs size debug
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#:finish-wrap-proc list
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#:hard-break-proc (λ (q) (char=? (car (quad-elems q)) #\newline))
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#:soft-break-proc soft-break?) lbr))
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(module+ test
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(require rackunit))
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@ -165,108 +171,109 @@
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(require rackunit)
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(test-case
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"chars"
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(check-equal? (linewrap (list) 1) null)
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(check-equal? (linewrap (list a) 1) '(1))
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(check-equal? (linewrap (list a b) 1) '(1 1))
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(check-equal? (linewrap (list a b c) 1) '(1 1 1))
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(check-equal? (linewrap (list a b c) 2) '(2 1))
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(check-equal? (linewrap (list x x x x) 2) '(2 2))
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(check-equal? (linewrap (list x x x x x) 3) '(3 2))
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(check-equal? (linewrap (list x x x x x) 1) '(1 1 1 1 1))
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(check-equal? (linewrap (list x x x x x) 10) '(5))))
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(check-equal? (linewrap (list) 1) (list))
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(check-equal? (linewrap (list a) 1) (list (list a)))
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(check-equal? (linewrap (list a b) 1) (list (list a) lbr (list b)))
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(check-equal? (linewrap (list a b c) 1) (list (list a) lbr (list b) lbr (list c)))
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(check-equal? (linewrap (list a b c) 2) (list (list a b) lbr (list c)))
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(check-equal? (linewrap (list x x x x) 2) (list (list x x) lbr (list x x)))
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(check-equal? (linewrap (list x x x x x) 3) (list (list x x x) lbr (list x x)))
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(check-equal? (linewrap (list x x x x x) 1)
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(list (list x) lbr (list x) lbr (list x) lbr (list x) lbr (list x)))
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(check-equal? (linewrap (list x x x x x) 10) (list (list x x x x x)))))
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(module+ test
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(test-case
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"chars and spaces"
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(check-equal? (linewrap (list a sp b) 1) '(1 1))
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(check-equal? (linewrap (list a b sp c) 2) '(2 1))
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(check-equal? (linewrap (list a sp b) 3) '(3))
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(check-equal? (linewrap (list a sp b c) 3) '(1 2))))
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(check-equal? (linewrap (list a sp b) 1) (list (list a) lbr (list b)))
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(check-equal? (linewrap (list a b sp c) 2) (list (list a b) lbr (list c)))
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(check-equal? (linewrap (list a sp b) 3) (list (list a sp b)))
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(check-equal? (linewrap (list a sp b c) 3) (list (list a) lbr (list b c)))))
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(module+ test
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(test-case
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"leading & trailing spaces"
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(check-equal? (linewrap (list sp x) 2) '(1))
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(check-equal? (linewrap (list x sp) 2) '(1))
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(check-equal? (linewrap (list sp x sp) 2) '(1))
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(check-equal? (linewrap (list sp sp x sp sp) 2) '(1))
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(check-equal? (linewrap (list sp sp x sp sp x sp) 1) '(1 1))))
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(check-equal? (linewrap (list sp x) 2) (list (list x)))
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(check-equal? (linewrap (list x sp) 2) (list (list x)))
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(check-equal? (linewrap (list sp x sp) 2) (list (list x)))
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(check-equal? (linewrap (list sp sp x sp sp) 2) (list (list x)))
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(check-equal? (linewrap (list sp sp x sp sp x sp) 1) (list (list x) lbr (list x)))))
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(module+ test
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(test-case
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"hard hyphens"
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(check-equal? (linewrap (list hyph) 1) '(1))
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(check-equal? (linewrap (list hyph hyph) 1) '(1 1))
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(check-equal? (linewrap (list hyph hyph) 2) '(2))
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(check-equal? (linewrap (list hyph hyph hyph) 2) '(2 1))
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(check-equal? (linewrap (list x hyph) 1) '(1 1))
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(check-equal? (linewrap (list a b hyph c d) 1) '(1 1 1 1 1))
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(check-equal? (linewrap (list a b hyph c d) 2) '(2 2 1))
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(check-equal? (linewrap (list a b hyph c d) 3) '(3 2))
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(check-equal? (linewrap (list x x hyph x x) 4) '(3 2))
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(check-equal? (linewrap (list x x hyph x x) 5) '(5))))
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(check-equal? (linewrap (list hyph) 1) (list (list hyph)))
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(check-equal? (linewrap (list hyph hyph) 1) (list (list hyph) lbr (list hyph)))
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(check-equal? (linewrap (list hyph hyph) 2) (list (list hyph hyph)))
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(check-equal? (linewrap (list hyph hyph hyph) 2) (list (list hyph hyph) lbr (list hyph)))
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(check-equal? (linewrap (list x hyph) 1) (list (list x) lbr (list hyph)))
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(check-equal? (linewrap (list a b hyph c d) 1)
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(list (list a) lbr (list b) lbr (list hyph) lbr (list c) lbr (list d)))
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(check-equal? (linewrap (list a b hyph c d) 2) (list (list a b) lbr (list hyph c) lbr (list d)))
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(check-equal? (linewrap (list a b hyph c d) 3) (list (list a b hyph) lbr (list c d)))
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(check-equal? (linewrap (list x x hyph x x) 4) (list (list x x hyph) lbr (list x x)))
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(check-equal? (linewrap (list x x hyph x x) 5) (list (list x x hyph x x)))))
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(module+ test
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(test-case
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"soft hyphens"
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(check-equal? (linewrap (list shy) 1) '(0))
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(check-equal? (linewrap (list shy shy) 2) '(0))
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(check-equal? (linewrap (list shy shy shy) 2) '(0))
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(check-equal? (linewrap (list x shy) 1) '(1))
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(check-equal? (linewrap (list x shy shy shy shy) 1) '(1))
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(check-equal? (linewrap (list shy) 1) (list (list)))
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(check-equal? (linewrap (list shy shy) 2) (list (list)))
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(check-equal? (linewrap (list shy shy shy) 2) (list (list)))
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(check-equal? (linewrap (list x shy) 1) (list (list x)))
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(check-equal? (linewrap (list x shy shy shy shy) 1) (list (list x)))
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;; todo: degenerate cases that don't work without continuations
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;(check-equal? (linewrap (list x x shy x x) 1) (list x 'lb x 'lb x 'lb x))
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;(check-equal? (linewrap (list x x shy x x) 2) (list x x 'lb x x))
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(check-equal? (linewrap (list x x shy x x) 3) '(3 2))
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(check-equal? (linewrap (list x x shy x x) 4) '(4))
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(check-equal? (linewrap (list x x shy x x) 5) '(4))
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(check-equal? (linewrap (list x x shy x sp x) 4) '(3 1))))
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;(check-equal? (linewrap (list x x shy x x) 1) (list x br x br x br x))
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;(check-equal? (linewrap (list x x shy x x) 2) (list x x br x x))
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(check-equal? (linewrap (list x x shy x x) 3) (list (list x x shy) lbr (list x x)))
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(check-equal? (linewrap (list x x shy x x) 4) (list (list x x x x)))
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(check-equal? (linewrap (list x x shy x x) 5) (list (list x x x x)))
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(check-equal? (linewrap (list x x shy x sp x) 4) (list (list x x x) lbr (list x)))))
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#|
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(module+ test
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(test-case
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"zero width nonbreakers"
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;; todo: fix
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(check-equal? (linewrap (list sp zwx) 2) '(1))
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(check-equal? (linewrap (list zwx sp) 2) '(1))
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(check-equal? (linewrap (list sp zwx sp) 2) '(1))
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(check-equal? (linewrap (list sp sp zwx sp sp) 2) '(1))
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(check-equal? (linewrap (list sp sp zwx sp sp zwx sp) 2) '(4))))
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(check-equal? (linewrap (list sp zwx) 2) (list (list zwx)))
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(check-equal? (linewrap (list zwx sp) 2) (list (list zwx)))
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(check-equal? (linewrap (list sp zwx sp) 2) (list (list zwx)))
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(check-equal? (linewrap (list sp sp zwx sp sp) 2) (list (list zwx)))
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(check-equal? (linewrap (list sp sp zwx sp sp zwx sp) 2) (list (list zwx sp sp zwx)))))
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(module+ test
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(test-case
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"hard breaks"
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(check-equal? (linewrap (list br) 2) (list)) ;; only insert a break if it's between things
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(check-equal? (linewrap (list a br b) 2) (list (list a) (list b)))
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(check-equal? (linewrap (list a b br) 2) (list (list a b)))
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(check-equal? (linewrap (list a b br br) 2) (list (list a b)))
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(check-equal? (linewrap (list x br x x) 3) (list (list x) (list x x)))
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(check-equal? (linewrap (list x x br x) 3) (list (list x x) (list x)))
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(check-equal? (linewrap (list x x x x) 3) (list (list x x x) (list x)))
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(check-equal? (linewrap (list x x x sp x x) 2) (list (list x x) (list x) (list x x)))
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(check-equal? (linewrap (list x x x sp x x) 3) (list (list x x x) (list x x)))))
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(check-equal? (linewrap (list lbr) 2) (list)) ;; only insert a break if it's between things
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(check-equal? (linewrap (list a lbr b) 2) (list (list a) lbr (list b)))
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(check-equal? (linewrap (list a b lbr) 2) (list (list a b)))
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(check-equal? (linewrap (list a b lbr lbr) 2) (list (list a b) lbr (list)))
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(check-equal? (linewrap (list x lbr x x) 3) (list (list x) lbr (list x x)))
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(check-equal? (linewrap (list x x lbr x) 3) (list (list x x) lbr (list x)))
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(check-equal? (linewrap (list x x x x) 3) (list (list x x x) lbr (list x)))
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(check-equal? (linewrap (list x x x sp x x) 2) (list (list x x) lbr (list x) lbr (list x x)))
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(check-equal? (linewrap (list x x x sp x x) 3) (list (list x x x) lbr (list x x)))))
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(module+ test
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(test-case
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"hard breaks and spurious spaces"
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(check-equal? (linewrap (list a sp sp sp br b) 2) (list (list a) (list b)))
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(check-equal? (linewrap (list x sp br sp sp x x sp) 3) (list (list x) (list x x)))
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(check-equal? (linewrap (list sp sp x x sp sp br sp sp sp x) 3) (list (list x x) (list x)))
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(check-equal? (linewrap (list a sp b sp sp br sp c) 3) (list (list a sp b) (list c)))
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(check-equal? (linewrap (list x x x x) 3) (list (list x x x) (list x)))
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(check-equal? (linewrap (list x x x sp x x) 2) (list (list x x) (list x) (list x x)))
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(check-equal? (linewrap (list x x x sp x x) 3) (list (list x x x) (list x x)))))
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(check-equal? (linewrap (list a sp sp sp lbr b) 2) (list (list a) lbr (list b)))
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(check-equal? (linewrap (list x sp lbr sp sp x x sp) 3) (list (list x) lbr (list x x)))
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(check-equal? (linewrap (list sp sp x x sp sp lbr sp sp sp x) 3) (list (list x x) lbr (list x)))
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(check-equal? (linewrap (list a sp b sp sp lbr sp c) 3) (list (list a sp b) lbr (list c)))
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(check-equal? (linewrap (list x x x x) 3) (list (list x x x) lbr (list x)))
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(check-equal? (linewrap (list x x x sp x x) 2) (list (list x x) lbr (list x) lbr (list x x)))
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(check-equal? (linewrap (list x x x sp x x) 3) (list (list x x x) lbr (list x x)))))
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(define (visual-wrap str int [debug #f])
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(string-join
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(for/list ([qs (in-list (linewrap (for/list ([atom (atomize str)])
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(if (equal? (quad-elems atom) '(#\space))
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(struct-copy quad sp)
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(struct-copy quad q-one
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[attrs (quad-attrs atom)]
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[elems (quad-elems atom)]))) int debug))])
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(list->string (map (λ (q) (car (quad-elems q))) qs))) "|"))
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(for/list ([x (in-list (linewrap (for/list ([atom (atomize str)])
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(if (equal? (quad-elems atom) '(#\space))
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(struct-copy quad sp)
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(struct-copy quad q-one
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[attrs (quad-attrs atom)]
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[elems (quad-elems atom)]))) int debug))]
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#:when (and (list? x) (andmap quad? x)))
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(list->string (map car (map quad-elems x))))
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"|"))
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(module+ test
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(test-case
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@ -289,9 +296,10 @@
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(check-equal? (visual-wrap "My dog has fleas" 16) "My dog has fleas")))
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(define (pagewrap xs size [debug #f])
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(break xs size debug
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#:hard-break-proc (λ (x) (and (quad? x) (memv (car (quad-elems x)) '(#\page))))
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#:soft-break-proc (λ (x) (eq? x 'lb))))
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(add-between
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(break (flatten xs) size debug
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#:hard-break-proc (λ (x) (and (quad? x) (memv (car (quad-elems x)) '(#\page))))
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#:soft-break-proc (λ (x) (and (quad? x) (eq? x lbr)))) pbr))
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(define pbr (q #:size #false #:elems '(#\page)))
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(module+ test
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@ -301,51 +309,45 @@
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(check-equal? (pagewrap null 2) (list))
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(check-equal? (pagewrap (list x) 2) (list (list x)))
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(check-equal? (pagewrap (list x x) 2) (list (list x x)))
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(check-equal? (pagewrap (list x x x) 1) (list (list x) (list x) (list x)))
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(check-equal? (pagewrap (list x x x) 2) (list (list x x) (list x)))
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(check-equal? (pagewrap (list x x x) 1) (list (list x) pbr (list x) pbr (list x)))
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(check-equal? (pagewrap (list x x x) 2) (list (list x x) pbr (list x)))
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(check-equal? (pagewrap (list x x x) 3) (list (list x x x)))
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(check-equal? (pagewrap (list x x x) 4) (list (list x x x)))
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(check-equal? (pagewrap (list x 'lb x x) 2) (list (list x) (list x x)))))
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(check-equal? (pagewrap (list x lbr x x) 2) (list (list x) pbr (list x x)))))
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(module+ test
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(test-case
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"hard page breaks"
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(check-equal? (pagewrap (list x pbr x x) 2) (list (list x) (list x x)))
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(check-equal? (pagewrap (list x pbr x x) 1) (list (list x) (list x) (list x)))
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; todo: fix double breaks
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#;(check-equal? (pagewrap (list x pbr pbr x x) 1) (list (list x) (list) (list x) (list x)))
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#;(check-equal? (pagewrap (list x pbr pbr x x) 2) (list (list x) (list) (list x x)))
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(check-equal? (pagewrap (list 'lb x 'lb 'lb pbr 'lb x x 'lb) 2) (list (list x) (list x x)))))
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(check-equal? (pagewrap (list x pbr x x) 2) (list (list x) pbr (list x x)))
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(check-equal? (pagewrap (list x pbr x x) 1) (list (list x) pbr (list x) pbr (list x)))
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(check-equal? (pagewrap (list x pbr pbr x x) 1) (list (list x) pbr (list) pbr (list x) pbr (list x)))
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(check-equal? (pagewrap (list x pbr pbr x x) 2) (list (list x) pbr (list) pbr (list x x)))
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(check-equal? (pagewrap (list lbr x lbr lbr pbr lbr x x lbr) 2) (list (list x) pbr (list x x)))))
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(module+ test
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(test-case
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"composed line breaks and page breaks"
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; todo: fix empty test
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#;(check-equal? (pagewrap (linewrap null 1) 2) (list (list (list))))
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(check-equal? (pagewrap (linewrap (list x) 1) 2) (list (list (list x))))
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(check-equal? (pagewrap (linewrap (list x x x) 1) 2) (list (list (list x) (list x)) (list (list x))))
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(check-equal? (pagewrap (linewrap (list x x x) 2) 2) (list (list (list x x)) (list (list x))))
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(check-equal? (pagewrap (linewrap (list x x x) 2) 1) (list (list (list x)) (list (list x)) (list (list x))))))
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(check-equal? (pagewrap (linewrap null 1) 2) (list))
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(check-equal? (pagewrap (linewrap (list x) 1) 2) (list (list x)))
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(check-equal? (pagewrap (linewrap (list x x x) 1) 2) (list (list x lbr x) pbr (list x)))
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(check-equal? (pagewrap (linewrap (list x x x) 2) 2) (list (list x x) pbr (list x)))
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(check-equal? (pagewrap (linewrap (list x x x) 2) 1) (list (list x) pbr (list x) pbr (list x)))))
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(define (slug . xs) (q #:attrs (hasheq) #:elems xs))
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(define (linewrap2 xs size [debug #f])
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(break xs size debug
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#:break-val 'lb
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#:hard-break-proc (λ (q) (and (quad? q) (memv (car (quad-elems q)) '(#\newline))))
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#:soft-break-proc soft-break?
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#:finish-wrap-proc (λ (pcs) (list (apply slug pcs)))))
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(add-between
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(break xs size debug
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#:hard-break-proc (λ (q) (memv (car (quad-elems q)) '(#\newline)))
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#:soft-break-proc soft-break?
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#:finish-wrap-proc (λ (pcs) (list (apply q pcs))))
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lbr))
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(module+ test
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(test-case
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"hard breaks and spurious spaces with slugs"
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(check-equal? (linewrap2 (list a sp sp sp br b) 2) (list (slug a) 'lb (slug b)))
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(check-equal? (linewrap2 (list x sp br sp sp x x sp) 3) (list (slug x) 'lb (slug x x)))
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(check-equal? (linewrap2 (list sp sp x x sp sp br sp sp sp x) 3) (list (slug x x) 'lb (slug x)))
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(check-equal? (linewrap2 (list a sp b sp sp br sp c) 3) (list (slug a sp b) 'lb (slug c)))
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(check-equal? (linewrap2 (list x x x x) 3) (list (slug x x x) 'lb (slug x)))
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(check-equal? (linewrap2 (list x x x sp x x) 2) (list (slug x x) 'lb (slug x) 'lb (slug x x)))
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(check-equal? (linewrap2 (list x x x sp x x) 3) (list (slug x x x) 'lb (slug x x)))))
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|#
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(check-equal? (linewrap2 (list a sp sp sp lbr b) 2) (list (q a) lbr (q b)))
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(check-equal? (linewrap2 (list x sp lbr sp sp x x sp) 3) (list (q x) lbr (q x x)))
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(check-equal? (linewrap2 (list sp sp x x sp sp lbr sp sp sp x) 3) (list (q x x) lbr (q x)))
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(check-equal? (linewrap2 (list a sp b sp sp lbr sp c) 3) (list (q a sp b) lbr (q c)))
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(check-equal? (linewrap2 (list x x x x) 3) (list (q x x x) lbr (q x)))
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(check-equal? (linewrap2 (list x x x sp x x) 2) (list (q x x) lbr (q x) lbr (q x x)))
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(check-equal? (linewrap2 (list x x x sp x x) 3) (list (q x x x) lbr (q x x)))))
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